Device for feeding air to furnaces



(Np Model.) l 2 Sheets-Shep#I 1. W. J. BRDSHAW UKW. W. COWLEY.

D EVIGE POP. PEBDING AIRTO'PURNAGBS. No. 275,574.

Patented Apr.10,1883.

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(No Model.)

UNITED STATES l PATENT OFFICE.

WILLIAM J. BRADSHAVV AND WILLIAM IV. COWLEY, OF CLEVELAND, OHIO.

DEVI-CE FOFI FEEDING AIR TO FURNACES.

SPECIFICATION forming part of Letters Patent No. 275,574, dated April 10, 1883. applicati@ filed April s. Issa. (No model.)

To all whom it may concern:

Be it known that we, WILLIAM J. BRAD-- SHAW and WILLIAM W. GOWLEY, citizens of the United States of America, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain n'ew and useful Improvements in Devices for Feeding Air to Furnaces; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to makeV and use the same, reference -being had to the accompanying drawings, and to letters or figures of reference marked thereou, which form a part of this specication.

This invention relates to improvements in devices for feeding air to furnaces; and it consists in the arrangement of a series of air and steam injectorfpipes having within a conical section of the pipes spirallyarranged webs, whereby the combined steam and air,

Vas they are injected over the fire-surface, will have a whirling motion, and more thoroughly agitate the smoke and gases as they rise over the fuel, and produce a better combustion and large saving of fuel, and leave but little smoke, all of which will bc hereinafter more fully described.

Figure 1 is an elevation of the front end of a boiler and furnace, showing the arrangement ofthe steam-pipe. Fig. 2 is a side elevation of the boiler and iurnace, partly in section, showing the tire-box and the injection-pipe. Figs. 3 and 4 are sections of an injector-tube, showing the spiral webs. Fig. 5 is an end view of the conical section ofthe injection-pipe. Fig. 6 is a view of the collar to support the steam-jet pipe. Fig. 7 is a section of the steam-jet pipe. Fig. 8 is an enlarged section of the tire-box. Fig. 9 is asectional view of the device enlarged and a part of a furnace, showing the smoke-box and end of the boiler. Fig. 10 is a front view ofithe head F in Fig. 9.

A represents the boiler, which is stationary and set, in the usual manner, in brick in asonry, and to which this. improvement is applied by having suitable holes made in the masonry immediately over each fire-door and between these or wherever it may be requisite for aninjector-pipe to be placed.

B is the fire-box.

O is a steam-pipe, which is connected with the steam-dome on top of the boiler, and is carried along the top ot' the boiler and down in front, and thence across the front, as seen in Fig. 1, where it isproperly supported at a a. At c c c2 there are branch jet-pipes C', of the construction shown in Fig.l7, which are within the entrance of the short pipe D, which is cylindrical, and has connected with it inwardly a conical section, E, widening toward the rebox. To the outer end of the tube D thereis attached the collar F, which has a central bearing, f, for the support of the end c3 ot' the steam-jet C', as shown in Fig. 6. In the construction ot' this pipe the short tube D may be threaded at each end, and the conical section E and the collar Fcan be screwed on; or the whole pipe may be made in one piece. In the conical section E there are arranged several spiral webs, c e c c, as represented in Figs. 3, 4, and 5, similar to the webs of a ships propeller, the purpose of which is to give the steam and air a rotary and spiral movement inwardly as they pass into the firebox and over thev burning fuel. The collar F being much larger than the steam-jet pipe C', and also being open to the outer air, as

`shown in Fig. 2 by the arrows at b b, the air is freely admitted within the pipe D, and, with the steam from thejet-pipe c3, passes into the tire-box in such proportion and quantity as properly to aid in the combustion of the asv cending gases over the fuel and greatly to economize the fuel. rIhe steam and air combined, passing through the spirally-arranged webs within the conical section, obtain a spiral movement whichY will continue to a considerable distance within the tire-box, and by this action keep the products of the combustion of the fuel longer over the fire, and consequently burn them 'more thoroughly before they pass beyond thebridge-wall and into the upward draft.

We claim- 1n steam and air injectors for aiding combustion, a stationary injector-pipe consisting of the straight pipe D and conical section E, said In testimony whereof we afxour signatures conical section opening into the furnace, and in presence of two witnesses. having four spirally-arranged Webs or projeetions running the entire length and cx- WILLIAM J. BRADSHAW. 5 tending nearly half-Way across said conical TILLIAM W. COVVLEY.

section, leaving the centerof the pipe entirely open, in combination with a stationary steam- Witnesses:

jet pipe projecting into the tube D, snbstan- H. W. GANFIELD,

tiaily as and for the purpose shown and de- GEORGE P. PHIBBS.

1o scribed. 

